/in/foo.cc: In function 'bool bfs(int)':
/in/foo.cc:21:12: warning: unused variable 'p' [-Wunused-variable]
  int i,j,s,p,q,ip,ie;
            ^
/in/foo.cc:21:14: warning: unused variable 'q' [-Wunused-variable]
  int i,j,s,p,q,ip,ie;
              ^
/in/foo.cc: In function 'bool bfs1(int)':
/in/foo.cc:80:10: warning: unused variable 's' [-Wunused-variable]
  int i,j,s,p,q,ip;
          ^
/in/foo.cc:80:12: warning: unused variable 'p' [-Wunused-variable]
  int i,j,s,p,q,ip;
            ^
/in/foo.cc:80:14: warning: unused variable 'q' [-Wunused-variable]
  int i,j,s,p,q,ip;
              ^
/in/foo.cc: In function 'bool bfs2(int)':
/in/foo.cc:120:10: warning: unused variable 's' [-Wunused-variable]
  int i,j,s,p,q,ip,ie;
          ^
/in/foo.cc:120:12: warning: unused variable 'p' [-Wunused-variable]
  int i,j,s,p,q,ip,ie;
            ^
/in/foo.cc:120:14: warning: unused variable 'q' [-Wunused-variable]
  int i,j,s,p,q,ip,ie;
              ^
/in/foo.cc: In function 'bool solve(int)':
/in/foo.cc:344:14: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
              for(j=0;j<nc[to-n-1];j++)
              ^~~
/in/foo.cc:346:8: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
        to=ip;
        ^~
/in/foo.cc:184:10: warning: unused variable 's' [-Wunused-variable]
  int i,j,s,p,q,dx,dy,id,ip,from,to;
          ^
/in/foo.cc:184:12: warning: unused variable 'p' [-Wunused-variable]
  int i,j,s,p,q,dx,dy,id,ip,from,to;
            ^
/in/foo.cc:184:14: warning: unused variable 'q' [-Wunused-variable]
  int i,j,s,p,q,dx,dy,id,ip,from,to;
              ^
/in/foo.cc:184:28: warning: unused variable 'from' [-Wunused-variable]
  int i,j,s,p,q,dx,dy,id,ip,from,to;
                            ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:360:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b;
      ^
/in/foo.cc:360:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b;
        ^
/in/foo.cc:363:12: warning: unused variable 'p' [-Wunused-variable]
  int i,j,s,p,q;
            ^
/in/foo.cc:363:14: warning: unused variable 'q' [-Wunused-variable]
  int i,j,s,p,q;
              ^
/in/foo.cc: In function 'bool solve(int)':
/in/foo.cc:357:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^